In the Line of Duty 4 (1989)

Two detectives who are up to their necks in trouble and in each other's face, as they try to shut down a drug-trafficking scheme that could be connected with international ties to organized crime. But in the midst of their investigation, innocent immigrant dock worker Luk Wan-Ting gets caught up in the mix when he witnesses the murder of an intelligence operative and is framed for the crime.

• Release Date: 1989-07-21
• Runtime: 1h 34min
• Director: Yuen Woo-Ping